/*
 * Copyright Thoughtworks, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.thoughtworks.go.security;

import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class TestIVProvider implements IVProvider {
    private static final byte[] TEST_IV = Base64.getDecoder().decode("lzcCuNSe4vUx+CsWgN11Uw==");
    private static final ThreadLocal<IVProvider> override = new ThreadLocal<>();

    public static void with(IVProvider provider, Runnable block) {
        override.set(provider);
        try {
            block.run();
        } finally {
            override.remove();
        }
    }

    @Override
    public byte[] createIV() throws NoSuchAlgorithmException {
        if (null != override.get()) {
            return override.get().createIV();
        }
        return TEST_IV;
    }
}
